SP-2231: Improved error message in ArchivingDlgViewModel.AddFileGroup
SP-2231: Improved error message in ArchivingDlgViewModel.AddFileGroup

gmartin7/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,sillsdev/libpalaso,sillsdev/libpalaso,gmartin7/libpalaso,ermshiperete/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso